7213 ACD/P4ADBB
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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7213 ACD/P4ADBB Bearing Product Overview & Core Advantages
The 7213 ACD/P4ADBB is a precision duplex pair of angular contact ball bearings designed for applications demanding exceptional rotational accuracy and rigidity. This back-to-back (DB) arrangement is preloaded to Light / Class B specifications, providing superior stability and stiffness to handle combined loads—significant radial and bidirectional axial forces. Manufactured to the exacting P4A tolerance class, it ensures minimal runout and high positional accuracy, making it an ideal solution for high-speed, high-precision machinery where reliability is paramount.
7213 ACD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7213 | Basic bearing designation: 65 mm bore, 120 mm OD, 46 mm width. |
| AC | Angular Contact design with a 25° contact angle for optimal axial load capacity. |
| D | Duplex pair (two bearings supplied as a matched set). |
| P4A | High precision tolerance class exceeding ABEC 7, ensuring ultra-precise dimensions and running accuracy. |
| DB | Back-to-Back mounting arrangement. This configuration provides high moment rigidity and excellent stability under complex loading conditions. |
| B | Light preload grade applied to the duplex set, reducing axial and radial play for enhanced system stiffness. |
7213 ACD/P4ADBB Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The back-to-back duplex arrangement creates a wide, rigid support system that effectively resists overturning moments and complex combined loads. The 25° contact angle is optimized to handle substantial bidirectional axial loads in addition to high radial loads (Dynamic Load Rating: 23,400 lbf).
Precision & High-Speed Performance: The P4A tolerance class guarantees tight dimensional control for precise shaft positioning. The lightweight phenolic resin cage minimizes centrifugal forces, contributing to a high limiting speed of 36,000 rpm. The bearings are pre-lubricated for immediate operation.
Material & Construction: Manufactured from high-grade chrome steel for both rings and balls, ensuring high durability and long service life under demanding conditions. The open design allows for customized lubrication regimes to suit specific application needs within a temperature range of -30°C to 110°C.
7213 ACD/P4ADBB Bearing Typical Application Areas
The 7213 ACD/P4ADBB is engineered for high-performance applications, including:
- Machine Tool Spindles: For milling, grinding, and turning centers requiring high speed, accuracy, and rigidity.
- Precision Gearboxes: Where precise shaft alignment and minimal deflection are critical.
- High-Frequency Motors and Spindles: In applications demanding low vibration and high rotational speeds.
- Industrial Pumps and Compressors: For handling significant axial and radial loads in a compact envelope.
